P0029: Exhaust Valve Control Solenoid Circuit Range/Performance Bank 2
The P0029 code indicates that the Engine Control Module (ECM) has detected a malfunction in the exhaust valve control solenoid circuit for Bank 2. This solenoid is part of the variable valve timing (VVT) system, which adjusts the timing of the exhaust valves to optimize engine performance, fuel economy, and emissions. The code is triggered when the ECM detects that the solenoid's electrical circuit is out of range or not performing as expected, often due to a faulty solenoid, wiring issues, or low oil pressure. Bank 2 refers to the side of the engine opposite cylinder #1.
01. Most Common Causes
- Faulty exhaust valve control solenoid on Bank 2
- Wiring or connector issues in the solenoid circuit
- Low engine oil level or dirty oil
- Oil pressure problems
- ECM software or hardware failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or engine hesitation
- Reduced engine power and fuel economy
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan the vehicle for codes and record freeze frame data.
Step 2: Inspect the exhaust valve control solenoid and its wiring for damage or corrosion.
Step 3: Check engine oil level and condition; replace if necessary.
Step 4: Test the solenoid resistance with a multimeter and compare to specifications.
Step 5: Perform a bidirectional test to command the solenoid on/off using a scan tool.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code as it can cause poor engine performance and potential damage to the VVT system. You may notice reduced power and fuel economy.
How much does it cost to fix?▼
The cost to fix P0029 typically ranges from $150 to $400, including parts and labor. The solenoid itself costs $50-$150, and labor can add $100-$250 depending on the vehicle.